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Growth of Co nanoparticles on a nanostructured θ-Al2O3 film on CoAl(1 0 0) |
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| Authors: | V Rose V Podgursky R Franchy |
| Institution: | a Center for Nanoscale Materials, Argonne National Laboratory, Argonne, IL 60439, USA b Department of Materials Technology, Tallinn University of Technology, 19086 Tallinn, Estonia c Institute for Surfaces and Interfaces (ISG 3), Research Center Jülich, 52425 Jülich, Germany |
| Abstract: | We have investigated the growth of Co nanoparticles on θ-Al2O3/CoAl(1 0 0) by means of Auger electron spectroscopy (AES), high-resolution electron energy loss spectroscopy (EELS), low energy electron diffraction (LEED) and scanning tunneling microscopy (STM). Due to Volmer-Weber growth, Co forms particles with a mean diameter of approximately 2.5 nm and height of 0.8 nm. Even on the entirely covered oxide, there is no Ostwald ripening and Co particles stay structurally isolated. The nanoparticles exhibit a small size distribution and tend to form chains, as predetermined by the streak structure of the oxide template. For sufficient high coverages Co-core-CoO-shell nanoparticles may be evidenced, which is explained as a result of surfactant oxygen. The nanostructured particles may open the door to numerous applications, such as in catalysis and magnetoelectronic applications, where large areas of ordered nanodots are desired. |
| Keywords: | Auger electron spectroscopy (AES) Electron energy loss spectroscopy (EELS) Low energy electron diffraction (LEED) Scanning tunneling microscopy (STM) Cobalt Aluminum oxide Cobalt oxide Clusters |
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